Same issue. On Windows 7 with DirectX 12, when I start WoW Windows tells me that WoW had made changes that require turning off Aero. Changing to DirectX 11 stops that message/change.
Same issue. On Windows 7 with DirectX 12, when I start WoW Windows tells me that WoW had made changes that require turning off Aero. Changing to DirectX 11 stops that message/change.